Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e81a180315a32c…

MALICIOUS

PDF

60.4 KB Created: 2020-12-07 17:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 840dcd3af3e41bebbd475797a11a0d54 SHA-1: cbcaab83e38871d310fb978b0297d57e66d3abaa SHA-256: 35e81a180315a32c61a2ceff7f8b1bde63d34c55d76a532a4593788a781dbceb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?utm_term=spanish+imperfect+worksheet
    • https://vawavujak.weebly.com/uploads/1/3/4/3/134350312/sisorusevu.pdf
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/9129212.pdf
    • https://cdn-cms.f-static.net/uploads/4483842/normal_5fac2cd91cd84.pdf
    • https://punulivolajes.weebly.com/uploads/1/3/4/6/134603903/zusegapin_toxejil_rikozo_kumufotunapod.pdf
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f97c85072644.pdf
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/tefowe.pdf
    • https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/mojozonaleduz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosalizuzu/elementary_classroom_websites.pdf
    • https://uploads.strikinglycdn.com/files/14b25cbf-45eb-4269-845d-52725bb18402/crochet_rug_patterns_uk.pdf
    • https://static1.squarespace.com/static/5fc5aa440b6b03258f55d983/t/5fcbf95d3ff1011540db407c/1607203165504/31596034562.pdf
    • https://uploads.strikinglycdn.com/files/3da07077-8adb-44c1-beb8-8a99ff5f9185/hp_serial_check.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe290df3de5e49b52ddba7/1606297870453/minecraft_stained_glass_recipe.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/51851926635.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/17645999442.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae5c.bin
bd0a172a17b6cd3ffbab6c859fb18db7cc0221dcf043abb4d58e524711e286e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5C 5484 bytes
font_01_sfnt_off0000c0ed.bin
f76c7f36ca308b2fca783447430340265a32b1b465e9eccd5306018829a00e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 10648 bytes

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